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Voice Gateways System Manual 87
Caller ID Standard The country standard and data
transmission method
Sweden, DTMF
CID Alerting Method The method of alerting on the
existence of CID data
Polarity Reversal
On-hook data transmission
timing method
The timing for transmission of
CID data
Post first ring signal
2-Wire Impedance The impedance presented
between the A and B wires of
the telephone line in active state
(nominal impedance).
CTR21
(ETSI complex =
270Ω+750Ω||150nF))
Table B-1: Default Telephony Parameters
Parameter Definition Default